Hi, thank you for your question!
Unfortunately, the BSD Jersey Barrier guard will only fit certain hubs and i don't think they are guaranteed to fit any Mission hubs.
We currently don't stock any specific hub guards for Mission, but we do stock lots of universal hub guards that will fit, you can find them here:
https://www.sourcebmx.com/us/BMX-Hub-Guards/c-528.aspx#

ruaidrifromUnited Kingdomasks

will this fit the BSD swerve cassette hub?

SourceBMX Replies:

Hello, Thanks for contacting us! - Unfortunately the only one we have left is for the BSD pro and west coaster hub, we cannot guarantee this would work on the swerve hub, but we can gladly find you alternatives.